Employee retirement plan (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Retirement Benefits [Abstract]
Employer matching contribution, percent of match			25.00%
Employer matching contribution, percent of employees' gross pay			6.00%
Maximum annual contributions per employee			$ 500
Vesting period (in years)			2 years
Annual vesting percentage			50.00%
Vesting percentage after two years of employment			1
Contributions made	$ 100,000	$ 100,000	$ 400,000	$ 300,000